namespace BulkArchiveMailer.Core
{
    /// <summary>
    /// One configured mail template: which files it applies to (by file
    /// name suffix, "{login}_{FileSuffix}.7z"), plus its Subject/BodyHtml.
    /// Replaces the old fixed pair of named templates (ssh_access /
    /// config_update) with an arbitrary, operator-editable list -
    /// AppSettingsData.Templates now holds a List&lt;MailTemplateDefinition&gt;
    /// instead of two hard-coded slots.
    ///
    /// FileSuffix is the only identifier a template needs: it must be
    /// non-empty and unique (case-insensitively) among all configured
    /// templates for ArchiveScanner's suffix-to-template lookup to be
    /// unambiguous. Enforcing that (non-empty + unique) is SettingsForm's
    /// job at save time, not this class's - a plain data holder has no
    /// validation of its own.
    /// </summary>
    public sealed class MailTemplateDefinition
    {
        public string DisplayName { get; set; } = "";

        /// <summary>
        /// Suffix of the file name this template renders for: matches
        /// files named "{login}_{FileSuffix}.7z" (case-insensitive; see
        /// FilenameParser/ArchiveScanner). Must be non-empty and unique
        /// among all configured templates - see class remarks.
        /// </summary>
        public string FileSuffix { get; set; } = "";

        public string Subject { get; set; } = "";

        public string BodyHtml { get; set; } = "";

        /// <summary>
        /// Optional regular expression the parsed login (from
        /// "{login}_{FileSuffix}.7z") must match (case-insensitively) for
        /// this template to actually apply, checked by ArchiveScanner AFTER
        /// the file's suffix has already matched this template. Empty (the
        /// default) means "no restriction" - the original, pre-v1.2.0
        /// behavior where suffix alone decides the match. Validated for
        /// compilability by SettingsForm at save time; ArchiveScanner
        /// itself treats an uncompilable pattern defensively as "does not
        /// match" rather than throwing, in case an operator hand-edits
        /// config.json with a broken regex.
        /// </summary>
        public string LoginPattern { get; set; } = "";
    }
}